The influence of surface textural properties and adsorption temperature on H2 adsorption and storage performance of MIL-88B(Fe) MOFs

To advance the establishment of a stable H 2 economy we need to solve the issue regarding its storage. The physicochemical properties of Metal Organic Frameworks (MOFs) make them suitable for H 2 storage. Therefore, here, we synthesized two Iron-based MOFs (12-MIL-88 B(Fe), 24-MIL-88 B(Fe) at different reaction times (12 h and 24 h), to investigate the relationship between adsorption temperature and pressure with the material's surface textural properties towards H 2 storage (at 30 °C, 0 °C, −78.5 °C, and −196.15 °C and from vacuum pressure to 55 bar). Results showed that at 30 °C and 0 °C adsorption temperature, H 2 adsorption capacity of 24-MIL-88 B(Fe) was higher than 12-MIL-88 B(Fe) suggesting that at this condition the adsorption performance of the material is dependent on pore volume, surface area, and adsorption pressure. Adsorption tests conducted at −78.5 °C and cryogenic temperature (−196.15 °C) the adsorption capacity of 12-MIL-88 B(Fe) was constantly higher than 24-MIL-88 B(Fe) suggesting that at very low temperatures the pore size of material influence its adsorption performance. Notably, at all the temperatures studied, adsorption pressure continued to positively promote the amount of H 2 adsorption. Results from this study can help in selecting the best material for H 2 storage under different temperature conditions.